balloch



2 sheetssheet 1.

(No Model.)

C. BALLOGH.

TELEPHONE CABINET.

N0. 359,492. Patented Mar. 15, 1887.

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(No Model.) I 2 sheetssheer 2.

C, BALLOCH.

. TELEPHONE CABINET.

No. 359,492. Patented Mar. 5, 1887-.

' ?!ir/l `UrurED STATES -PATENT OFFICE.

CHARLES EALLocH, oE NEW YORK, N. Y.

TELEPHONE-CABINET.

SPIECI }ICA'IION forming part of Letters Patent No. 359,492, dated March-15, 1887.

Application filed April "I, 1886.

To all whom, it mag/concern:

Be it known that I, CHARLES BALLocH, a citizen of the Dominion of Canada, residing in New York, in the county of New York and State of New York, have invented a new and useful Improvement in Telephone-Cabinets, of which the following is a specification.

This invention relates to the construction of closets and cabinets to be used in large rooms to inclose telephones or telegraph-instruments, or in other places where it is desired the closet or cabinet shall neither transmit sound to nor receive sound from the outside.

The invention consists, primari-ly,in a telephone or other," closet or cabinet,the walls,&c., whereof are constructed substantially as hereinafter set forth, and are thereby adapted to cut off the passage of sound. To render the closet more effectuallysound-proof I also construct the windows and doors in peculiar fashion; and the invention further consists in these and'other details of construction.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure l is a perspective view of a telephonecabinet embodying my invention. Fig. 2 is a perspective view of a section or portion of one of its walls. Fig. Sis a horizontal section on line 3 3 of Fig. 1. Figs. 4 and 5 are respectively a side elevation and cross-section, showing the outer casings of the double walls composed of flexible material, as cloth or felt. Fig. 6 is a partial elevation of a window which `may be advantageously used, and Fig. 9 is a section showing the manner in which the glass is preferably secured. Fig. 7 shows the preferred method of making the joints between the pieces or parts making up the walls, ne. Fig. 8 is a sectional view intended to illustrate the meeting faces of a door andits `iamb.

In Fig. 1 the wall of the cabinet is made up of an inner casing, A', and outer casing, A, with au inclosed dead-air space, b, between them, and the flexible diaphragm B, dividing said space. These casings or sub-walls may be made of any known suitable material; but it is of course desirable that each of them be made as tight as possible, because sound will be only imperfectly shut off if cracks or mi- 5o nute openings of any kind be left therein. I

Serial No. 198,113. (No model.)

therefore prefer to employ the common grooveand-tenon joint between the parts thereof, or

some other form of joint in which the parts meet closely,it is true, but with abutting faces having other than flat plane surfaces, so that a straight-line passage through the wall cannot exist therein. The groove-and-tenonjoint is a familiar and simple one and answers the purpose very well, as the air cannot pass through it without making several turns, these turns serving to break up the sound-waves and to prevent the transmission of noise through the wall.

rIhe passage of noise is additionally guarded against by the use of a diaphragm, B, dividing the air-space into two spaces, b b, as indicated in Fig. 2. rllhis diaphragm or partition may be of paper, felt, rubber, or any other suitable material,and more than one may be employed, if thought best.

In Figs. 4 and 5 the wall or section of wall may consist of a frame, D, covered at the sides with cloth, rubber, or other fabric, d. This form of the invention makes a very light and cheap cabinet.

In Figs. 6 and 9, E represents a glass window, and E the frame thereof. To prevent vibrations of the glass in obedience to the sound-waves, I prefer to set it in lead or other soft metal, as shown at e. Vhen the window embodies more than one sheetof glass, all may be similarly set.

The doors of my cabinet maybe constructed like the walls, and it is desirable that their edge-faces and the corresponding faces of the door-jambsbe formed with anumber of angles, after the similitude ofthe doors 0f burglarproof safes. This is illustrated in Fig. 8,where F may represent the door, and F the jamb, the separating-linef indicating the conformationof their meeting faces.

Of course the cabinet may be provided with a covering made in any of the ways set forth ICO to resist vibration under the net-ion of soundwnves without being so heavy or solid as to be objectionable or expensive.

I ani of eonrse aware than ib is now ensronlary to build inelosnres around telephones to prevent the talk taking place thereat from being overheard by those in the rooin7 :is weil :is to obviate interference by outside noise with the operation of bhe telephone, and hence I do not claim any Snell inclosnre, broadly.

I claimw l. The sonndrdendeni11;,r telephone-cabinet having walls Consisting oi' an inner and outer casing with un intermediate air-space and a lexible diaphragm of paper, felt, rubber, or other like material in sind space between said inner and outer cnsings, substantially as Specilied.

2. The soniiddemlening telephone-rnbinel; having walls consistingr of an outer and inner casi ng with an intermediate nir-Space between, seid inner sind outer ensings being composed l of iiexible niaterinl--snch as cloth, rubber, or the like-secured to a suitable frnmeubstantinlly as specied.

3. The sound-deadening teiephonecabinei; having Walls furnished with flexible sounddeadening diaphragms with an air-space between the inner and outer easings of said double walls and provided with aJ window, the glass frames whereof have soft-metal settings, substantially as specified.

4. The sonnd-deadening telephone-cabinet havingI double Walls consistingof an inner and outer flexible fabric easing of cloth, rubber, or like materiel secured to a frame, said cabinet; being furnished with n. door and door-oasings, bh e faces whereof are provided with two or more offsets or angles, substantially as specified.

CHARLES BALLOCH.

\Vitnesses:

1I. M. MUNDAY, Emil'ND ADoooK. 

